It says "Abandon Hope (of staying clean) All Ye Who Enter Here"
... or it's an invitation to plunder, take your pick.
It's the kind of place I walk into and think ... this is going to be F.U.N. :-)
Strobist setup info: a single SB-900 on a 2-metre light stand off to the left, 105mm zoom, full power. Eat them batteries baby!!!!